#pragma warning disable IDE0073 // The file header does not match the required text
// https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/grpc/test-services/sample/Tests/Server/UnitTests/Helpers/TestServerCallContext.cs
#region Copyright notice and license

// Copyright 2019 The gRPC Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#endregion

using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Grpc.Core;

namespace KurrentDB.Core.XUnit.Tests.Services.Transport.Grpc;

#nullable enable

public class TestServerCallContext : ServerCallContext {
	private readonly Metadata _requestHeaders;
	private readonly CancellationToken _cancellationToken;
	private readonly Metadata _responseTrailers;
	private readonly AuthContext _authContext;
	private readonly Dictionary<object, object> _userState;
	private WriteOptions? _writeOptions;

	public Metadata? ResponseHeaders { get; private set; }

	private TestServerCallContext(Metadata requestHeaders, CancellationToken cancellationToken) {
		_requestHeaders = requestHeaders;
		_cancellationToken = cancellationToken;
		_responseTrailers = new Metadata();
		_authContext = new AuthContext(string.Empty, new Dictionary<string, List<AuthProperty>>());
		_userState = new Dictionary<object, object>();
	}

	protected override string MethodCore => "MethodName";
	protected override string HostCore => "HostName";
	protected override string PeerCore => "PeerName";
	protected override DateTime DeadlineCore { get; }
	protected override Metadata RequestHeadersCore => _requestHeaders;
	protected override CancellationToken CancellationTokenCore => _cancellationToken;
	protected override Metadata ResponseTrailersCore => _responseTrailers;
	protected override Status StatusCore { get; set; }
	protected override WriteOptions? WriteOptionsCore { get => _writeOptions; set { _writeOptions = value; } }
	protected override AuthContext AuthContextCore => _authContext;

	protected override ContextPropagationToken CreatePropagationTokenCore(ContextPropagationOptions? options) {
		throw new NotImplementedException();
	}

	protected override Task WriteResponseHeadersAsyncCore(Metadata responseHeaders) {
		if (ResponseHeaders != null) {
			throw new InvalidOperationException("Response headers have already been written.");
		}

		ResponseHeaders = responseHeaders;
		return Task.CompletedTask;
	}

	protected override IDictionary<object, object> UserStateCore => _userState;

	public static TestServerCallContext Create(Metadata? requestHeaders = null, CancellationToken cancellationToken = default) {
		return new TestServerCallContext(requestHeaders ?? new Metadata(), cancellationToken);
	}
}
